Lovejoy is in hot water for not paying the school fees of his teenage daughter, Vicky. Meanwhile (and much to Eric's disgust) another schoolgirl asks the firm to sell some erotic drawings for her. When Lovejoy sees the same girl being threatened by a man at the school, he decides there's more to the story than meets the eye. He also manages to vex Susan, his former wife, as they try to cope with their daughter's problems.

Vicky finds an old claymore (a Scottish sword) in her attic. Lovejoy buys it at auction and is offered much more than it's worth for it. Puzzled, he investigates and finds the claymore is a map to buried treasure. Someone tries to steal it, so Lovejoy is not the only one hot on the trail. But the treasure is elusive - a supermarket has been built on top of it.

Lovejoy's daughter Vicky disappears, then announces she is living with an older man whose wife has died. Susan, Vicky's mother, does not approve. When Lovejoy investigates, he finds that Vicky's boyfriend is not a widower at all. Meanwhile, Lovejoy is also busy uncovering a fake art scam being run by the son of a cabinet minister...